Beasthide Shifting

Has this been done, yet? While trying to go to sleep and failing due to retarded-heat, I was thinking about how to make the cast from The Dragon Below trilogy into 4E, and thought about how to do beasthide shifting for Geth.

The result I came to was like, regen 2 while bloodied, +1 to AC and Fort defenses for the encounter. I had also considered doing temp hp instead of regen, and briefly considered finding a way to work in resist all instead of that, if at all possible.